Mystic Decree 
World Enchantment
$1.01 #25039 0.30 30.9 years
All creatures lose flying and islandwalk.
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Cards similar to Mystic Decree expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Gravity Sphere85%
$53.46↑#248320.2732.3 years↑
"All creatures lose flying."
Undertow75%
$1.63↑#31584↓0.2532.3 years↑
"Creatures with islandwalk can be blocked as though they didn't have islandwalk."
Whiteout72%
$0.30↓#249950.3331.3 years
"All creatures lose flying until end of turn."
Gosta Dirk72%
$18.71↑#30796↓0.40↑32.3 years↑
"Creatures with islandwalk can be blocked as though they didn't have islandwalk."
Crevasse71%
$1.47↑#31550↓0.2432.3 years↑
"Creatures with mountainwalk can be blocked as though they didn't have mountainwalk."
Deadfall71%
$1.49↑#31350↓0.53↑32.3 years↑
"Creatures with forestwalk can be blocked as though they didn't have forestwalk."
Lord Magnus71%
$3.54↑#30623↓0.3832.3 years↑
"Creatures with forestwalk can be blocked as though they didn't have forestwalk."
Great Wall70%
$1.27↑#30555↓0.04↓32.3 years↑
"Creatures with plainswalk can be blocked as though they didn't have plainswalk."
Ur-Drago70%
$18.37↑#30985↓0.00↓32.3 years↑
"Creatures with swampwalk can be blocked as though they didn't have swampwalk."
Quagmire70%
$1.68↑#31352↓0.00↓32.3 years↑
"Creatures with swampwalk can be blocked as though they didn't have swampwalk."
Staff of the Ages70%
$0.53↓#31324↓0.2931.3 years
"Creatures with landwalk abilities can be blocked as though they didn't have those abilities."